A method, in which a fan (126) equipped stove (120) of a sauna (110) is controlled automatically between an idle mode and a sauna bathing mode of the heating of the stove (120) based on relative air humidity of the sauna (110) sound measured from the sauna (110) a measured load on benches of the sauna (110) a motion sensing signal measured from the sauna (110) and/or the temperature of the stove (120). A controller (130), a stove (120) and a sauna (110) using the method are also described.